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I’m stuck on this equation, anyone got the answer?

Qrst is a parallelogram. determine the measure of ∠q pls

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase